/auth/auth0/callback is undefined

[Kailaash-Balachandran]

I just installed nodebb-plugin-sso-auth0 and created an app at Auth0. After successfull login at Auth0, when redirected, i get the following error. No restart or build helped.
Any suggesstions for the prorblem?

nodebb-plugin-sso-auth0

Internal Error.
Oops! Looks like something went wrong!

/auth/auth0/callback

undefined

The issue also appears in https://antergos.com/